+++ /dev/null
-package org.apache.lucene.analysis;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import org.apache.lucene.document.Fieldable;
-
-import java.io.Reader;
-import java.io.IOException;
-import java.util.Map;
-import java.util.HashMap;
-
-/**
- * This analyzer is used to facilitate scenarios where different
- * fields require different analysis techniques. Use {@link #addAnalyzer}
- * to add a non-default analyzer on a field name basis.
- *
- * <p>Example usage:
- *
- * <pre>
- * PerFieldAnalyzerWrapper aWrapper =
- * new PerFieldAnalyzerWrapper(new StandardAnalyzer());
- * aWrapper.addAnalyzer("firstname", new KeywordAnalyzer());
- * aWrapper.addAnalyzer("lastname", new KeywordAnalyzer());
- * </pre>
- *
- * <p>In this example, StandardAnalyzer will be used for all fields except "firstname"
- * and "lastname", for which KeywordAnalyzer will be used.
- *
- * <p>A PerFieldAnalyzerWrapper can be used like any other analyzer, for both indexing
- * and query parsing.
- */
-public final class PerFieldAnalyzerWrapper extends Analyzer {
- private Analyzer defaultAnalyzer;
- private Map<String,Analyzer> analyzerMap = new HashMap<String,Analyzer>();
-
-
- /**
- * Constructs with default analyzer.
- *
- * @param defaultAnalyzer Any fields not specifically
- * defined to use a different analyzer will use the one provided here.
- */
- public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer) {
- this(defaultAnalyzer, null);
- }
-
- /**
- * Constructs with default analyzer and a map of analyzers to use for
- * specific fields.
- *
- * @param defaultAnalyzer Any fields not specifically
- * defined to use a different analyzer will use the one provided here.
- * @param fieldAnalyzers a Map (String field name to the Analyzer) to be
- * used for those fields
- */
- public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer,
- Map<String,Analyzer> fieldAnalyzers) {
- this.defaultAnalyzer = defaultAnalyzer;
- if (fieldAnalyzers != null) {
- analyzerMap.putAll(fieldAnalyzers);
- }
- }
-
-
- /**
- * Defines an analyzer to use for the specified field.
- *
- * @param fieldName field name requiring a non-default analyzer
- * @param analyzer non-default analyzer to use for field
- */
- public void addAnalyzer(String fieldName, Analyzer analyzer) {
- analyzerMap.put(fieldName, analyzer);
- }
-
- @Override
- public TokenStream tokenStream(String fieldName, Reader reader) {
- Analyzer analyzer = analyzerMap.get(fieldName);
- if (analyzer == null) {
- analyzer = defaultAnalyzer;
- }
-
- return analyzer.tokenStream(fieldName, reader);
- }
-
- @Override
- public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException {
- Analyzer analyzer = analyzerMap.get(fieldName);
- if (analyzer == null)
- analyzer = defaultAnalyzer;
-
- return analyzer.reusableTokenStream(fieldName, reader);
- }
-
- /** Return the positionIncrementGap from the analyzer assigned to fieldName */
- @Override
- public int getPositionIncrementGap(String fieldName) {
- Analyzer analyzer = analyzerMap.get(fieldName);
- if (analyzer == null)
- analyzer = defaultAnalyzer;
- return analyzer.getPositionIncrementGap(fieldName);
- }
-
- /** Return the offsetGap from the analyzer assigned to field */
- @Override
- public int getOffsetGap(Fieldable field) {
- Analyzer analyzer = analyzerMap.get(field.name());
- if (analyzer == null)
- analyzer = defaultAnalyzer;
- return analyzer.getOffsetGap(field);
- }
-
- @Override
- public String toString() {
- return "PerFieldAnalyzerWrapper(" + analyzerMap + ", default=" + defaultAnalyzer + ")";
- }
-}